Granted Patent
Utility
US 4,589,689 · App. 06/600,662
Energized seal for upper termination
Inventor:
A. Michael Regan
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Apr 16, 1984
Inventor
A. Michael Regan
Assignee (at issue)
Hughes Tool Company LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.